This is the code:
#include <Arduino.h>
#include <WiFi.h>
#include <HTTPClient.h>
#include <ESPAsyncWebServer.h>
#include <stdarg.h>
#include <stdio.h>
#include <SPIFFS.h>
const char* ssid = "SSID";
const char* password = "password";
AsyncWebServer server(80);
static char log_print_buffer[512];
int vprintf_into_spiffs(const char* szFormat, va_list args) {
//write evaluated format string into buffer
int ret = vsnprintf (log_print_buffer, sizeof(log_print_buffer), szFormat, args);
//output is now in buffer. write to file.
if(ret >= 0) {
if(!SPIFFS.exists("/LOGS.txt")) {
File writeLog = SPIFFS.open("/LOGS.txt", FILE_WRITE);
if(!writeLog) Serial.println("Couldn't open spiffs_log.txt");
delay(50);
writeLog.close();
}
File spiffsLogFile = SPIFFS.open("/LOGS.txt", FILE_APPEND);
//debug output
//printf("[Writing to SPIFFS] %.*s", ret, log_print_buffer);
spiffsLogFile.write((uint8_t*) log_print_buffer, (size_t) ret);
//to be safe in case of crashes: flush the output
spiffsLogFile.flush();
spiffsLogFile.close();
}
return ret;
}
void setup() {
Serial.begin(115200);
delay(1000);
if (!SPIFFS.begin(true)) {
Serial.println("An Error has occurred while mounting SPIFFS");
return;
}
esp_log_set_vprintf(&vprintf_into_spiffs);
//install new logging function
//trigger some text
esp_log_level_set("TAG", ESP_LOG_DEBUG);
//write into log
esp_log_write(ESP_LOG_DEBUG, "TAG", "text!\n");
delay(1000);
WiFi.begin(ssid, password);
delay(1000);
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.println("Connecting to WiFi..");
}
Serial.println("Connected to the WiFi network");
Serial.println(WiFi.localIP());
server.on("/events", HTTP_GET, [](AsyncWebServerRequest *request){
if(SPIFFS.exists("/LOGS.txt")) {
request->send(SPIFFS, "/LOGS.txt", "text/plain");
} else {
request->send(200, "text/plain", "LOGS not found ! Restarting in 5 seconds..");
delay(5000);
ESP.restart();
}
});
server.begin();
File file2 = SPIFFS.open("/LOGS.txt");
if(!file2){
Serial.println("Failed to open file for reading");
return;
}
Serial.println("File Content:");
while(file2.available()){
Serial.write(file2.read());
}
file2.close();
Serial.println("End of file content");
}
void loop() {
if ((WiFi.status() == WL_CONNECTED)) { //Check the current connection status
HTTPClient http;
http.begin("http://jsonplaceholder.typicode.com/comments?id=10"); //Specify the URL
int httpCode = http.GET(); //Make the request
if (httpCode > 0) { //Check for the returning code
Serial.println();
Serial.printf("[HTTP] GET... code: %d\n", httpCode);
if(httpCode == HTTP_CODE_OK) {
String payload = http.getString();
Serial.println(payload);
Serial.println();
}
} else {
Serial.printf("[HTTP] GET... failed, error: %s\n", http.errorToString(httpCode).c_str());
}
http.end(); //Free the resources
}
delay(10000);
}
And it outputs:
Connected to the WiFi network
192.168.1.107
File Content:
text!
text!
End of file content
So it ouputs text! twice…
Shouldn’t it output debug messages ?